docs(readme): restore Star History chart

[Dessalines39394]

The Star History chart was removed in 27479dd because the previous service could no longer render it. That problem remains, as the chart relies on GitHub stargazer data that is now restricted, and it is worth fixing since project growth is a useful signal for contributors and users.

This PR restores the Star History chart in README.md, README.vi.md, and README.zh.md at its original location between the contributors section and the license section, pointing to a working chart service.

Summary by CodeRabbit

• Documentation
  • Added Star History charts and links to the English, Vietnamese, and Chinese README files.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 9017be8f-f9aa-4cc3-961a-2ee311b5530f

📥 Commits

Reviewing files that changed from the base of the PR and between 2fb8fab and 0bb470f.

📒 Files selected for processing (3)

• README.md
• README.vi.md
• README.zh.md

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

📜 Recent review details

🔇 Additional comments (3)

README.vi.md (1)

170-172: LGTM!

README.zh.md (1)

184-186: LGTM!

README.md (1)

187-189: 🩺 Stability & Availability

No issue found. The endpoint returns a non-empty SVG, and the page explicitly accepts the &Date fragment token while loading SakuraByteCore/codexmate.

			> Likely an incorrect or invalid review comment.

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📝 Walkthrough

Walkthrough

Added linked Star History chart sections to the English, Vietnamese, and Chinese README files.

Changes

Star History documentation

Layer / File(s)	Summary
Localized README Star History sections README.md, README.vi.md, README.zh.md	Added Star History headings and linked repository charts in three README languages.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 0bb47

This change restores a project-growth chart in the documentation without introducing an actionable merge-blocking risk; it is merge-ready after normal checks and review.

Suggested reviewers: ymkiux, awsl233777

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the restoration of the Star History chart in the README files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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